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    Gold nanostars: Benzyldimethylammonium chloride-assisted synthesis, plasmon tuning, SERS and catalytic activity

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    Fulltext not available
    Authors
    Ndokoye, P.
    Li, Xin Yong
    Zhao, Q.
    Li, T.
    Tade, M.
    Liu, S.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Ndokoye, P. and Li, X.Y. and Zhao, Q. and Li, T. and Tade, M. and Liu, S. 2016. Gold nanostars: Benzyldimethylammonium chloride-assisted synthesis, plasmon tuning, SERS and catalytic activity. Journal of Colloid and Interface Science. 462: pp. 341-350.
    Source Title
    Journal of Colloid and Interface Science
    DOI
    10.1016/j.jcis.2015.10.007
    ISSN
    0021-9797
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/45360
    Collection
    • Curtin Research Publications
    Abstract

    © 2015 Published by Elsevier Inc. Fabrication of Au nanostars (AuNSs) can expand the application range of Au nanoparticles because of their high electron density and localized surface plasmon resonance (LSPR) on branches. Exploiting this potential requires further refinement of length of the branches and radius of their tips. To this end, we successfully synthesized AuNSs with uniform and sharply-pointed branches by combining benzyldimethylammonium chloride (BDAC) and cetyltrimethylammonium bromide (CTAB) at low BDAC/CTAB ratios. Once mixed with CTAB, BDAC lowers the critical micelle concentration (CMC) for quick formation of the micelles, which provides favorable growth templates for AuNSs formation. Besides, BDAC increases the concentration of Cl-, which favors Ag+ in adsorbing on Au facets. This feature is crucial for the yield boosting and synergic shape control of AuNSs regardless of types of Au seeds used. Use of less amounts of seeds as the center of nucleation benefited sharper and longer growth of the branches. AuNSs exhibited excellent enhancement of surface-enhanced Raman scattering (SERS) intensities as the result of high electron density localized at the tips; however, the enhancement degree varied in accordance with the size of branches. In addition, AuNSs showed high catalytic performance toward the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). Efficient catalysis over AuNSs originates from their corners, stepped surfaces and high electron density at the tips.

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